$9x\:+6x^2\:+7w\:+8y\:+12w\:+100x\:+4x^2\:+12x\:+5w\:+5y$
$\frac{-49+\sqrt{-147}}{7}$
$a^2+2ab+b^2-b^2+2ba+a^2$
$\frac{z}{10}=3$
$7-2\left(-3\right)+6\left(4\right)-8$
$+7+4+3$
$\frac{1+\cos x}{\sin^2x}=\frac{1}{1-\cos x}$
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